James curean



(No Model.)

J. CURRAN. Heat Alarm.

No. 243,518. Patented June 28,1881.

UNITED STATES PATENT OFFICE,

JAMES O URRAN, OF NEWv YORK, N. Y.

HEAT-ALARM.

SPECIFICATION forming part of Letters Patent No. 243,518, dated June 28,1881.

` Appncafion fiiea May 18,1881. (Nomad.)

To all whom it may concern:

Be-it known that I, JAMES CURRAN, of the city, county, and State of NewYork, have invented a new and Improved Heat-Alarm Apparatus, of whichthe following is a specification.

Figure 1 is a side elevation of my improvement. Fig. 2 is an endelevalion ofthe same.

Similar letters of reference indicate corresponding parts.

The invention consists in constructing an apparatus for signalingchanges of temperature with an expansion-rod to be inserted in theheated tank or Chamber, a compound lever for multiplying the changes inlength of the eXpansion-rod, a connecting-rod, and a steam valve andWhistle connected with the heatingpipe, whereby changes in lengthof theexpansion-rod will open the stcainivalve and cause the whistle to give asignal, as will be hereinafter fully described.

A represents a tank of water or other liquid, or a close chamber orother compartment, which is to be kept at a uniforln temperature.

To the bottom or fioor of the tank or chamber A is secured the lower endof a rod, B, of iron or other metal that Will expand and contract withchanges of temperature. The upper end of the rod B is pivoted to the endof 30 a bar, C, which is hinged or fulcrumed to a f hanger, D, attachedto the ceiling of the room in which the chamber or tank A is placed. Thebar O passes through two hangers, E F, attaehed at their upper ends tothe ceiling ofv the room'. The bar O is connected at its other end, by apair of short connecting-bars, G, with the end of a bar, H, placedbeneath and parallel with the bar C. ThebarH passes through the hangersE F, is fulcrumed to the hanger F, and its other end is connected, by apair of short connecting-bars, I, with the end of a third bar, J, whichis placed beneat-h and parallel with the bar H. The bar J passes throughthe hangers E F and is fulcrumed to the hanger 45 `E. The bars (J H Jthus form a compound lever, and may have other similar bars connectedwith them, ifdesired, but generally three bars will be sufficient. Thehangers E F are slotted to receive the bars (J H J, or each of the saidhangers can be formed of two parallel bars. To the other end of the lastbar, J, is pivoted the upper end of the rod K, the lower end of which isconnected with the handle of the valve L, that admits steam to thesteam-whistle M from the pipe N, that contains steam for heating thetank or chainber A. Several holes are formed in the bar J to receive theupper end of the rod K, for regnlatin g the amount of inovement of thesaid rod K.

With this construction changes of tempera- 60 ture in the tank orchamber A will cause the rod B to expand or contract, and the change oflength of the said rod B is iucreased or multiplied by the compoundlever O H J and opens the valve L, admitting steam to the whistle M, andgiving a signal to the attendant that the heatin g apparatus requiresattention.

Havin g thus fully described my inventioinl claim as new, and desire tosecure by Ijetters Patent- 1. A heat-alarm apparatus constructedsubstantially as herein shown and (lescribed, consisting of theeXpansion-rod B, the compound lever G H J, the connecting-rod K, and thesteam Valve and whistle L M, as set forth.

2. In a heat-alarm apparatus, the combination, with the heated tank orchamber A and the heating-pipe N, of the eXpansion-rod B, the compoundlever O H J, the connecting-rod K, and the steam-valve L and whistle M,substantially as herein shown and described, whereby changes oftemperature. in the said tank or Chamber will admit steam to the whistleand give a signal, as set forth.

JAS. OUR RAN.

Witnesses:

J AMEs T. GRAHAM, U. SEDGwIoK.

